module teapo.storage.attached.dom {

​

  export class UpdateStorage {

​

    constructor(

      private _parentElement: HTMLElement,

      private _byName: { [fullPath: string]: HTMLElement; },

      private _document: { createElement(tag: string): HTMLElement; }) {

    }

​

    update(file: string, property: string, value: string, callback?: (error: Error) => void): void {

​

      var element = this._getExistingElement(file);

​

      if (!element) {

        element = UpdateStorage.createElement(this._parentElement, file, this._document);

        this._byName[file] = element;

      }

​

      UpdateStorage.updateProperty(element, property, value);

​

      this._parentElement.setAttribute('data-edited-utc', Date.now() + '');

​

      callback(null);

    }

​

    remove(file: string, callback?: (error: Error) => void): void {

​

      var element = this._getExistingElement(file);

      if (!element) {

        callback(new Error('file does not exist.'));

        return;

      }

​

      element.parentElement.removeChild(element);

      delete this._byName[file];

​

      this._parentElement.setAttribute('data-edited-utc', Date.now() + '');

​

      callback(null);

    }

​

    static createElement(parentElement: HTMLElement, fullPath: string, _document: { createElement(tag: string): HTMLElement; }): HTMLElement {

      element.setAttribute('data-path', fullPath);

      parentElement.appendChild(element);

      return element;

    }

​

    static updateProperty(element: HTMLElement, property: string, value: string): void {

      element.setAttribute('data-meta-' + encodeForAttributeName(property), value);

    }

​

    private _getExistingElement(fullPath): HTMLElement {

      var element = this._byName.hasOwnProperty(fullPath) ? this._byName[fullPath] : null;

      return element;

    }

​

  }

​

}